diff --git a/webapp/src/edu/cornell/mannlib/vitro/webapp/dao/jena/DataPropertyDaoJena.java b/webapp/src/edu/cornell/mannlib/vitro/webapp/dao/jena/DataPropertyDaoJena.java
index 9806874b4..8c641c488 100644
--- a/webapp/src/edu/cornell/mannlib/vitro/webapp/dao/jena/DataPropertyDaoJena.java
+++ b/webapp/src/edu/cornell/mannlib/vitro/webapp/dao/jena/DataPropertyDaoJena.java
@@ -776,7 +776,9 @@ public class DataPropertyDaoJena extends PropertyDaoJena implements
             Resource resource = sol.getResource("property");
             String uri = resource.getURI();
             DataProperty property = getDataPropertyByURI(uri);
-            properties.add(property);
+            if (property != null) {
+                properties.add(property);
+            }
         }
         return properties; 
     }
diff --git a/webapp/src/edu/cornell/mannlib/vitro/webapp/dao/jena/ObjectPropertyDaoJena.java b/webapp/src/edu/cornell/mannlib/vitro/webapp/dao/jena/ObjectPropertyDaoJena.java
index d52ac5cf7..7e2a9240f 100644
--- a/webapp/src/edu/cornell/mannlib/vitro/webapp/dao/jena/ObjectPropertyDaoJena.java
+++ b/webapp/src/edu/cornell/mannlib/vitro/webapp/dao/jena/ObjectPropertyDaoJena.java
@@ -894,7 +894,9 @@ public class ObjectPropertyDaoJena extends PropertyDaoJena implements ObjectProp
             String uri = resource.getURI();
             log.debug("Found populated object property " + uri);
             ObjectProperty property = getObjectPropertyByURI(uri);
-            properties.add(property);
+            if (property != null) {
+                properties.add(property);
+            }
         }
         return properties; 
     }